Do Teenagers Respond to HIV Risk Information? Evidence from a Field Experiment in Kenya
通过肯尼亚的随机实验，发现向青少年提供关于伴侣年龄与艾滋病感染相对风险的信息，使少女怀孕率下降28%，而官方禁欲教育无效。
We use a randomized experiment to test whether and what information changes teenagers' sexual behavior in Kenya. Providing information on the relative risk of HIV infection by partner's age led to a 28 percent decrease in teen pregnancy, an objective proxy for the incidence of unprotected sex. Self-reported sexual behavior data suggests substitution away from older (riskier) partners and toward same-age partners. In contrast, the official abstinence-only HIV curriculum had no impact on teen pregnancy. These results suggest that teenagers are responsive to risk information, but their sexual behavior is more elastic on the intensive than on the extensive margin.